Update the list of percentiles for histograms

We modified dogstatsd to only include the 95th percentile.
This reflects the fact that we don't carry 75th, 85th, 99th
percentiles anymore.
add node-dogapi to library list
Merge pull request #69 from brettlangdon/add_node_dogapi

add node-dogapi to library list
Put the help section on the frontpage.

/help is now on the front page
adds descriptions to undescribed tasks
ignore more ruby manager files
docs for user inviting
updated after running tests on working ruby api add user
adds Chef Guide to menus
attempt at purple in the navbar
Adds initial Chef Guide
apparently I added a silent N into knife
apparently I added a silent N into knife, a p into upload, and forgot a period.
Merge branch 'master' of github.com:DataDog/documentation
updates Gems source for security
Skip .DS_Store files from mac
Merge branch 'master' of github.com:DataDog/documentation

Conflicts:
	.gitignore
Overview page with images and FAQ updates
Merge pull request #72 from DataDog/purple

WIP: attempt at purple in the navbar
Merge pull request #75 from DataDog/docsoverview

Overview page with images and FAQ updates